Magnetic aligned Fe3O4-reduced graphene oxide/waterborne polyurethane composites with controllable structure for high microwave absorption capacity. (November 2019)

• Record Type: Journal Article
• Authors: Dai, Mengwei; Zhai, Yinghao; Wu, Lei; Zhang, Yong
• Is Part Of: Carbon. Volume 152(2019)
• Page Start: 661
• Page End: 670
• Publication Date: 2019-11
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.05.067
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Fe3 O4 -reduced graphene oxide (FRGO)/waterborne polyurethane (WPU) composites with controllable structure and high microwave absorption capacity were developed. The aligned structure of FRGO in the FRGO/WPU composites was realized by a magnetic-field-induced method. WPU dispersion with nano-scaled particles could suppress the aggregation of FRGO during the drying process. The FRGO/WPU composites have much high complex permittivity, dielectric loss tangent, and microwave absorption capacity owing to the magnetic alignment. WPU with 2% FRGO achieved the minimum reflection loss value of −67.8 dB, which can be attributed to the orientation and three-dimensional structure of FRGO. The effective bandwidth wider than 14 GHz can be reached by a combination of two layers of composites with different permittivity through theoretical calculation. The aligned FRGO/WPU composites have a great future in the application of microwave absorption materials. Graphical abstract: Image 1